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x in (-oo:+oo)
4*x-((2/2)*x) = 45 // - 45
4*x-((2/2)*x)-45 = 0
4*x-x-45 = 0
3*x-45 = 0 // + 45
3*x = 45 // : 3
x = 45/3
x = 15
x = 15
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